I get this error while fetching the teacher id, what can be done??

CodePudding user response：

That's because you are using Future Function to get the current user, you can get the current user simply like this:

  User  teacher = FirebaseAuth.instance.currentUser!;

CodePudding user response：

That happens because you are trying to access a future result when it's not ready yet.

As you see, your teacher variable is a Future<FirebaseUser>, so at that point moving fast machine speed you reach the access to teacher.uid before it's completed and still a promise.

On that line that you call the teacher, change from:

Future<FirebaseUser> Function() teacher = FirebaseAuth.instance.currentUser;

To this:

FirebaseUser teacher = FirebaseAuth.instance.currentUser!;

With this you code will wait until FirebaseAuth do all requests and return only the result.

You can look an example at https://github.com/FirebaseExtended/flutterfire/blob/8a2f512e6d52fa8e47ffc53e55b2593de61e2085/packages/firebase_auth/firebase_auth/example/lib/profile.dart#L34 Also at https://firebase.flutter.dev/docs/auth/usage